1又2/3÷7/12+1又2/3÷7/24+1又2/3÷3/24
=1又2/3×12/7+1又2/3×24/7+1又2/3×24/3
=1又2/3×(12/7+24/7+24/3)
=1又2/3×276/21
=5/3×276/21
=21又57/63
(-24/1)÷(1又4/3-8/7+12/7)
=-24分之1÷(4分之7-8分之7+12分之7)
=-24分之1÷(24分之42-24分之21+24分之14)
=-24分之1÷24分之35
=-35分之1
-2/3[(-3/2)²-2]
=-2分之3×(-3分之2)²+2分之3×2
=-3分之2+3
=3分之7
=2又3分之1